Messages in this thread | | | From | David Howells <> | Subject | Re: [PATCH 11/12] fscache: Fix fscache_cookie_put() to not deref after dec | Date | Wed, 25 Aug 2021 15:05:51 +0100 |
| |
Jeff Layton <jlayton@redhat.com> wrote:
> > fscache_cookie_put() accesses the cookie it has just put inside the > > tracepoint that monitors the change - but this is something it's not > > allowed to do if we didn't reduce the count to zero. > > Do you mean "if the count went to zero." ?
No. If *we* reduced the count to zero, it falls to us to destroy the object, so we're allowed to look into it again.
If we didn't reduce the count to zero, then someone else might destroy it before we look into it again.
David
| |